half effective inhibition concentration 半数有效抑制浓度 effective infective concentration 有效感染浓度 effective stress concentration coefficient 有效应力集中系数 ..
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但是又经过27个月后，幸存的感染艾滋病的儿童中只有一半的抗体浓度维持在有效水平，而健康儿童的数字几乎是90%。
But after a further 27 months, only half of the surviving HIV-infected children maintained antibody levels high enough to protect against measles, versus almost 90 per cent of healthy children.
结果：抗菌药物脂质体、纳米球、微球等可提高感染细胞或组织的药物浓度，同时具有缓释特性，延长有效药物浓度维持时间。
Results: the newer delivery systems increased drug concentration in infected cells or tissue, having slow release and lengthen of effective drug concentration.
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